Two-dimensional metal organic skeleton composite membrane material, and preparation method and application

A metal-organic framework and composite membrane technology, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as poor dispersion, poor membrane hydrophilicity, and low membrane efficiency, and achieve Increased adsorption capacity, improved cross-linking and sedimentation, and extended service life

Active Publication Date: 2019-08-27
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the water flux and mechanical strength of the MOFs composite membrane material obtained by this method are not ideal; the prior art of the Chinese Patent Publication No. CN108586760A, which was published on September 2, 2018, introduces a new type of MOFs/polymerization The method of preparing composite membranes solves the problems of low mechanical strength and low membrane efficiency of MOFs composite membranes in the traditional composite process, but there are still phenomena such as limited water flux and uneven membrane matrix.
[0005] The publication number of this research group is CN 108211825A, a metal-organic framework composite membrane material and its preparation and application. Aiming at the problem that the existing adsorbents and treatment methods are not effective in treating trace heavy metal ions in high-salt wastewater, the selected class The zeolite metal-organic framework coordination polymer is used as a func

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  • Two-dimensional metal organic skeleton composite membrane material, and preparation method and application
  • Two-dimensional metal organic skeleton composite membrane material, and preparation method and application
  • Two-dimensional metal organic skeleton composite membrane material, and preparation method and application

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Example Embodiment

[0040] Example 1

[0041] The preparation method of the two-dimensional metal organic framework composite membrane material of this embodiment includes the following steps:

[0042] (1) After mixing and dissolving zinc acetate, dimethylimidazole and N,N'-dimethylformamide in a molar ratio of 0.8:0.3:110, react at room temperature for 1 day, and the resulting mixed product is treated with water and methanol After repeated washing, the solid product is separated and dried to obtain granular ZIFs;

[0043] (2) After mixing the granular ZIFs, ethanol and n-hexane in a molar ratio of 0.23:225:250, grinding and reacting at room temperature for 3 hours, the resulting colloidal solution is chemically settled to separate the upper suspended matter, and dried to obtain two Dimensional metal organic framework coordination polymer;

[0044] (3) Mix polyvinylpyrrolidone, polyvinylidene fluoride, dimethylacetamide, and potassium chloride in a molar ratio of 0.3:7.5:36. After heating and stirring a...

Example Embodiment

[0046] Example 2

[0047] The preparation method of the two-dimensional metal organic framework composite membrane material of this embodiment includes the following steps:

[0048] (1) After mixing and dissolving zinc acetate, dimethylimidazole and N,N'-dimethylformamide in a molar ratio of 1.2:0.7:150, react at room temperature for 2 days, and the resulting mixed product is treated with water and methanol After repeated washing, the solid product is separated and dried to obtain granular ZIFs; figure 2 Shown: XRD test and analysis of the granular ZIFs show that the granular ZIFs have an octahedral structure and the lattice configuration is 2MI-Zn-2MI.

[0049] (2) After mixing the granular ZIFs, ethanol, and n-hexane in a molar ratio of 0.35:235:260, grinding and reacting at room temperature for 2 hours, the resulting colloidal solution is chemically settled to separate the upper suspension, and dried to obtain two Dimensional metal organic framework coordination polymer; such as...

Example Embodiment

[0057] Example 3

[0058] The preparation method of the two-dimensional metal organic framework composite membrane material of this embodiment includes the following steps:

[0059] (1) After mixing and dissolving zinc acetate, dimethylimidazole and N,N'-dimethylformamide in a molar ratio of 1.0:0.5:130, react for 1.5 days at room temperature, and the resulting mixed product is repeated with water and methanol After washing, the solid product is separated and dried to obtain granular ZIFs;

[0060] (2) After mixing granular ZIFs, ethanol, and n-hexane in a molar ratio of 0.27:231:256, grinding and reacting for 1 hour at room temperature, the resulting colloidal solution is chemically settled to separate the upper suspension, and dried to obtain two Dimensional metal organic framework coordination polymer;

[0061] (3) Mix the polyvinylpyrrolidone, polyvinylidene fluoride, dimethylacetamide, and potassium chloride in a molar ratio of 0.5:8.6:37, heat and stir at 80°C for 24 hours, the...

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Abstract

The invention discloses a two-dimensional metal organic skeleton composite membrane material, and a preparation method and application, and belongs to the technical field of water treatment. In orderto solve the problems such as deep purification of various heavy metal ions in industrial tail water with interference of alkaline-containing metal ions and insufficiency of mechanical strength existing in an existing absorption material, the two-dimensional organic skeleton material with special selectivity for heavy metal ions in complex industrial tail water is firstly synthesized, polyvinylidene fluoride is taken as a membrane carrier, a two-dimensional metal organic skeleton coordination polymer is taken as a loading object, and the polyvinylidene fluoride and the two-dimensional metal organic skeleton coordination polymer are fixed through polyethyleneimine/diallyl dimethyl ammonium chloride; and moreover, the invention provides the preparation method of the novel composite membranematerial with environmental function, which is the two-dimensional metal organic skeleton composite membrane, and the composite membrane material can realize one-step separation of heavy metal ion pollutants such as Ni<2+>, Pb<2+>, Cu<2+>, Cd<2+> and Zn<2+> in tail water efficiently.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a two-dimensional metal-organic framework composite membrane material, a preparation method and an application. Background technique [0002] Today, with the rapid development of industry, the improvement of economic level and quality of life, the problem of heavy metal pollution in water is becoming more and more serious. These heavy metal elements (nickel, copper, zinc, chromium, cadmium, lead, etc.) discharged into the environment enter the human body along the food chain and accumulate in the body, causing serious damage to the lungs, kidneys, digestive system, respiratory system and skin of the human body. Damage can range from disease-causing to teratogenic, cancer-causing or fatal in severe cases. Generally speaking, heavy metal ions in environmental water mainly come from the tail water discharge of industrial manufacturing and power generation in...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30B01J20/32C02F1/28C02F101/20
CPCB01J20/226B01J20/28033B01J20/30B01J20/321C02F1/288C02F2101/20
Inventor 张炜铭李婷施梦琦计成汉花铭潘丙才吕路
Owner NANJING UNIV
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